I have 2 9x12 fit Rollex's (there was a url link here which no longer exists). They are very simple so not much you can refurbish.
Film (plate) holders are easy to find on Ebay just search fpr 9x12 that finds them, most are from Germany, but beware there are many different variations, which I've tried to start to list (there was a url link here which no longer exists)
9x12 film can be bought from Foma, (not the US link),
in Norway who's a European distributor. I think Ilford films are available in 9x12 as well in Continental europe try Fotoimpex.de.
BTW I've found that even very rusty looking 9x12 plate holders can be restored very quickly with a good rub-down with wet an dry and a coat of satin black spray paint. You need to add a thin convertor to use film in the plate holders.
What camera have you bought ?
Ian